Eaton S611 User Manual

Also see for S611: Installation leaflet Quick start installation guide Installation leaflet

Contents

S611 Soft Starter MN03902011E—May 2012 www.eaton.com 55Over VoltageThe S611 monitors the maximum rms voltage and checks the value just prior to starting todetermine if a fault shall be issued and the start will be terminated. When the bypasscontactors are engaged, the S611 monitors the maximum rms voltage and issues a overvoltage fault if the measured value exceeds the threshold for the trip delay time. Note that theS611 will not generate an over voltage fault when the motor is starting.Over Voltage SettingsDevice Current ProtectionThe S611 has a number of protection mechanisms that cannot be disabled by the customer.These are to protect both the motor and the starter itself.Device Current Protection ValuesSCR Not Firing (SCR Not Conducting)The S611 has detection for SCRs not firing. This typically catches broken wires to the SCRs,disconnected cables, nonfunctioning SCRs, and firing circuit failure. This also captures OpenSCR condition. The firmware monitors the number of current stops detected after firing. If nocurrent stops are detected on a phase for a number of cycles, then the SCR not firing fault isissued.Shorted SCRThe S611 has detection for shorted SCRs. The shorted SCR fault is triggered if the S611detects current flowing when the motor is off or if the BEMF pulses for a phase disappearand the voltage across the SCR is near 0 (not exactly 0 due to noise considerations) when astart is commanded.The soft starter has several different modes of current and voltage protection to help protectthe motor and the starter itself. Depending on how the device is set up, different levels ofprotection can be attained.Parameter Set Point Range Step Default NotesTrip threshold OFF, 101–120%rated voltage1% 110% Settable from the UIMode O/P LEDProtection Under voltage %Trip delay 1–60 seconds 1 10 seconds Settable from the UIMode O/P LEDOperation Advanced Conf—P.21Type Trip ThresholdTime Before Trip(Seconds)When in EffectSCR inrush current 6x (Cat# FLA) <1.5 Always, when not in bypassSCR overcurrent 3x (FLA) At end of ramp Stall disabled, on SCRsContactor overcurrent 4x (Cat# FLA) 4.5 seconds9.0 seconds16.0 seconds23.0 seconds• Jam DIP switch and in bypass• Note these have beenmodified from S811 based oncontactor evaluationPole over temperature >100°C 1 second Alwayswww.comoso.com